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Location: 36 km NE from Kittila, Finland
Pokantie 541KiistalaFinland99250
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The Kittila mine is situated within the Kittila Greenstone belt, part of the Lapland Greenstone belt in the Proterozoic-age Svecofennian geologic province. The appearance and geology of the area is similar to that of the Abitibi region of the Canadian Shield. In northern Finland, the bedrock is typically covered by a thin but uniform blanket of unconsolidated glacial till. Bedrock exposures are scarce and irregularly distributed.The mine area is underlain by mafic volcanic and sedimentary rocks metamorphosed to greenschist assemblages and assigned to the Kittila group. The major rock units trend north to north-northeast and are near-vertical. The volcanics are further sub-divided into iron-rich tholeiitic basalts located to the west and magnesium-rich tholeiitic basalt, coarse volcaniclastic units, graphitic schist and minor chemical sedimentary rocks located to the east. The contact between these two rock units consists of a transitional zone (the "Porkonen Formation") varying between 50 and 200 metres in thickness. This zone is strongly sheared, brecciated and characterized by intense hydrothermal alteration and gold mineralization, features consistent with major brittle-ductile deformation zones. The zone is part of a major north-northeast-oriented shear zone (the "Suurikuusikko Trend").The Porkonen Formation hosts the Kittila gold deposit, which contains multiple mineralized zones stretching over a strike length of more than 25 kilometres. Most of the work at the Kittila mine has been focused on the 4.5 kilometre stretch that hosts the known gold in mineral reserves and mineral resources. From north to south, the zones are Rimminvuoma ("RimpiS"), the deep extension of Rimminvuoma ("Rimpi Deep"), North Rouravaara ("RouraN"), Central Rouravaara ("RouraC"), depth extension of Rouravaara and Suurikuusikko ("Suuri/Roura Deep"), Suurikuusikko ("Suuri"), Etela and Ketola. The Suuri and Suuri/Roura Deep zones include several parallel subzones that have previously been referred to as Main East, Main Central and Main West. The Suuri zone hosts approximately 5% of the current proven and probable gold reserve estimate on a contained gold basis, while Suuri Deep has approximately 20%, RouraN and RouraC approximately 3%, Roura Deep approximately 41%, Rimpi Deep approximately 24% and RimpiS approximately 7%.Gold mineralization in these zones is associated with intense hydrothermal alteration (carbonate-albite-sulphide), and is almost exclusively refractory, locked inside fine-grained sulphide minerals: arsenopyrite (approximately 73%) or pyrite (approximately 23%). The remainder is free gold, which is manifested as extremely small grains of gold in pyrite.
